Thank you all for your fast and most clarifying help!
What I indeed had overlooked, is the fact that MnS is regarded to be harmless in CAST materials, which is much easier to understand.
I was especially glad to read the detailed comments by kenvlach on the composition and his assessment of the...
A big, forged crankshaft was metallographically inspected. On the polished and etched surface near a notch radius at the tap, segregations of manganese sulfide (MnS) were found. The largest inclusions were between 100µm and 300µm wide. The grain size was irregular, indicating that the forging...
